#CONVERT .HGT FILES TO .DEM DOWNLOAD#

You will be asked to define the projection of the TIN, otherwise it will be assumed to be in the same projections as the project.ĬatchmentSIM also allows for a wide range of other GIS data sets to be imported and used in an analysis.

CatchmentSIM supports ASCII-TIN and 12d TIN formats. dt2)Ī Triangular Irregular Network (TIN) may be sampled to assign elevations to a CatchmentSIM DEM. CatchmentSIM supports importing and sampling of the following raster file formats: More information regarding reprojecting DEMs can be found in the Key Challenges section.ĬatchmentSIM supports a wide range of raster DEM file formats.

#CONVERT .HGT FILES TO .DEM DOWNLOAD#

Sampling of external DEMs can either be undertaken by Create DEM > Raster DEM or Create DEM > Download DEM Data for an online source. Sampling a DEM allows you to re-project the DEM and change the resolution whereas importing a DEM preserves the pixel dimensions and projection exactly. If the source data for the analysis is in the form of an external DEM, this information can either be imported ( Create DEM > Import DEM) or sampled (reading point elevation from the DEM to populate the elevation of blank pixels in a user-defined DEM)( Create DEM > Raster DEM). Watercourse data need only be in 2D, that is, non-visual data is not required ( GIS > Streams). Importing contour data requires GIS files containing line or polyline contours with non-visual data attached that contains elevation information ( GIS > Contours).

Sampling of ARC-INFO ASCII NET and 12d TIN (.12da) files is also supported.ĭata can also be downloaded from various online data sources. If the DEM is being imported or sampled, then a wide range of raster formats can be utilised. If the DEM is to be interpolated from contour and watercourse data then this data may be imported as:

The next stage in building a CatchmentSIM project is to import suitable GIS data from a number of supported data formats.

Convert .hgt files to .dem